Windows Authentication will be used if DestinationSqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials.
To connect as a different Windows user, run PowerShell as that user.

.PARAMETER DestinationSqlCredential
Allows you to login to servers using SQL Logins as opposed to Windows Auth/Integrated/Trusted. To use:

$dcred = Get-Credential, then pass this $dcred to the -DestinationSqlCredential parameter.

Windows Authentication will be used if DestinationSqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials.
To connect as a different Windows user, run PowerShell as that user.

.PARAMETER WhatIf
Shows what would happen if the command were to run. No actions are actually performed.

.PARAMETER Confirm
Prompts you for confirmation before executing any changing operations within the command.

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Updates the values for two configs, the IsSqlClrEnabled and DefaultBackupCompression, from sqlserver2014a to sqlcluster, using SQL credentials for sqlserver2014a and Windows credentials for sqlcluster.

Shows what would happen if the command were executed.
#>[CmdletBinding(DefaultParameterSetName="Default",SupportsShouldProcess=$true)]param([parameter(Mandatory=$true)][object]$Source,[parameter(Mandatory=$true)][object]$Destination,[System.Management.Automation.PSCredential]$SourceSqlCredential,[System.Management.Automation.PSCredential]$DestinationSqlCredential)DynamicParam{if($source){return(Get-ParamSqlServerConfigs-SqlServer$Source-SqlCredential$SourceSqlCredential)}}BEGIN{$configs=$psboundparameters.Configs$sourceserver=Connect-SqlServer-SqlServer$Source-SqlCredential$SourceSqlCredential$destserver=Connect-SqlServer-SqlServer$Destination-SqlCredential$DestinationSqlCredential$source=$sourceserver.DomainInstanceName$destination=$destserver.DomainInstanceName}PROCESS{$destprops=$destserver.Configuration.Properties# crude but i suck with properties$lookups=$sourceserver.Configuration.PsObject.Properties.Name|Where-Object{$_-notin"Parent","Properties"}$proplookup=@()foreach($lookupin$lookups){$proplookup+=[PSCustomObject]@{ShortName=$lookupDisplayName=$sourceserver.Configuration.$lookup.DisplaynameIsDynamic=$sourceserver.Configuration.$lookup.IsDynamic}}foreach($sourcepropin$sourceserver.Configuration.Properties){$displayname=$sourceprop.DisplayName$lookup=$proplookup|Where-Object{$_.DisplayName-eq$displayname}if($configs.length-gt0-and$configs-notcontains$lookup.ShortName){continue}$destprop=$destprops|Where-Object{$_.Displayname-eq$displayname}if($destprop-eq$null){Write-Warning"Configuration option '$displayname' does not exist on the destination instance."continue}If($Pscmdlet.ShouldProcess($destination,"Updating $displayname")){try{$destOldPropValue=$destprop.configvalue$destprop.configvalue=$sourceprop.configvalue$destserver.Configuration.Alter()Write-Output"Updated $($destprop.displayname) from $destOldPropValue to $($sourceprop.configvalue)"if($lookup.IsDynamic-eq$false){Write-Warning"Configuration option '$displayname' requires restart."}}catch{Write-Error"Could not $($destprop.displayname) to $($sourceprop.configvalue). Feature may not be supported."}}}